Pump.



K. D. SMITH.

PUMP.

APPLICATION FILED OCT. 24, 1914.

Patented Apr. 10, 1917.

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PUMP.

APPLICATION FILED OCT. 24. 1914.

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KARLzD. SMITH, OF BATTLE CREEK, MICHIGAN,.ASSIG1\TOB TO UNION STEAlVLPUMl? COMPANY, OF BATTLE CREEK, MICHIGAN.

PUMP.

Specification of Letters Patent.

Patented Apr. 16 1917..

Application filed October 24, 1914. Serial No. 868,397.

To all whom it may concern:

Be it known that I, KARL D. SMITH, a citizen of the United States, residing at Battie'Creek, Michigan, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

This invention relates to improvements in pumps.

My improvements are especially designed by me for embodiment in pumps for pumping milk and have shown the same in the accompanying drawings as I have embodied the same in practice in such a pump. My improvements are, however, desirable for embodiment in pumps designed for pumping other liquids.

The main objects of this invention are:

First, to provide an improved pump which will meet the strict and exacting requirements of the sanitary laws relating to the handling of milk.

Second, to provide. an improved pump which can be readily taken apart for cleaning and sterilization and one in which there are no inaccessible sharp corners or crevices in which material can collect.

Third, to provide an improved pump in which there are no movable parts or valves other than the piston.

Fourth, to provide an improved pump of large capacity.

Fifth, to provide an improved pump em-' bodying these advantages which is very simple and economical in structure.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which:

Figure I is a perspective view of my improved pump with the cylinder removed.

Fig. IT is an inside perspective view of the cylinder.

Fig. III is a central vertical longitudinal section, the piston and shaft being shown in full lines, the piston being at the limit of its in stroke.

Fig. IV is a similar longitudinal sectional view with the piston shownin longitudinal section. and at the limit of its out stroke.

V is a transverse section through the cylinder and piston on a line corresponding toline of Fig. IV.

ig. V1 is a side view ofthe pulley.

1n the drawing similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawing, the base 1 is of suitable design to support the pedestals'2 and 3. The cylinder 4 is closed at its outer end 5 and is provided with an outwardly projecting flange 6 at its inner end. The cylinder head 7 is provided with a bearing 8 projecting into the pedestal and is shouldered at 9 to receive the cylinder. The cyl inder and head are removably secured to the pedestal by means of the bolts 10. The cylinder is provided with opposed centrally disposed ports 11 one of which is the inlet and the other the outlet. The piston consists of a pair of disk-like heads 12 connected by a web-like partition wall 13, the piston beingshaped somewhat like a letter H. This partition wall 18 is provided with flanges l-i on its edges. The flanges 1% are slightly wider than the diameter of the inlet and outlet ports of the cylinder so that no matter in what position the piston may come to rest during its rotary motion the liquid cannot flow back from the discharge to the intake sides. The space between the pistion heads is equal to the stroke of the piston plus the diameter of the cylinder ports.

The piston heads are provided with openings or ports 15. These are arranged on opposite sides of the partition 13 and are preferably in the form of peripheral notches, as shown. The piston shaft or rod 16 is mounted for rotati've and reciprocating movement in the bearing 8 and provided with a packing 17 and packing gland 18. The shaft 16 is threaded into the pulley 19 so as to be readily removed therefrom. The pulley is provided with a shaft section 20 mounted in the pedestal 3 for sliding and rotative movement.

The pulley 19 is provided with annular cams 21 on its sides which coact with the rollers 22 mounted on suitable journals 23 and the pedestals so that the pulley is moved axially simultaneously with its rotation. The piston is pinned to the shaft so that it has a simultaneous rotary and reciprocatory movement, there being one complete forward and backward stroke of the piston to each complete revolution. Assuming the piston to be at the limit of its out stroke, shown in Fig. IV, and the upper cylinder port to be the inlet and the lower the discharge and the shaft pulley driven to the left considering the cylinder end the front of the pump, the fluid will, on the in stroke of the piston, enter the intake port and pass through the outer piston head port into the outer end of the cylinder. During this in stroke the liquid between the inner end of the piston and the piston head is forced out through the outlet port of the cylinder and the piston is rotated so as to shut off the outer end of the cylinder from the inlet port thereof and open the inner piston head, the piston having madea one-half revolution. On the out stroke of the piston the liquid in the outer end of the cylinder is discharged through the discharge port and the liquid from the inlet port flows through the port of the inner piston head into the inner end of the cylinder, the piston at the same time completing the other one-half of its revolution Which would again bring it to the position shown in Fig. IV. It will be seen that the pump discharges on both its in and out strokes, thus rendering it of large capacity.

The cylinder can be readily removed for cleansing and sterilizing purposes and also the piston, which is pinned to the shaft as indicated by dotted lines in Fig. IV. The piston and the shaft itself can be easily removed as occasion requires.

I have not attempted to show various modifications which I contemplate as I believe the disclosure made will enable those skilled in the art to which my invention relates to embody or adapt the same as-may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is: a

1. In a structure of the class described, the combination of a base provided with a pair of pedestals, a cylinder closed at its outer end and having an outwardly projecting flange at its inner end and opposed centrally disposed ports, a cylinder head having a central bearing arranged in one of said pedestals, the cylinder and head being removably secured to the pedestal by bolts arranged through the flange of the cylinder and the cylinder head, a piston comprising a pair of disk-like heads connected by a longitudinal wall having flanges on its edges fitting the walls of the cylinder, the width of the flange being greater than the diameter of the cylinder ports, said heads having peripheral ports on opposite sides of the 2. In a structure of the class described,

the combination of a pair of pedestals, a cylinder closed at its outer end and having opposed centrally disposed ports, a cylinder head having a central bearing arranged in one of said pedestals, the cylinder and head being removably secured to one pedestal, a piston comprising a pair of disk-like heads connected by a longitudinal wall having flanges on its edges fitting the walls of the cylinder, the width of the flanges being greater than the diameter of the cylinder ports, said heads having ports on opposite sides of the said wall, a reciprocating and rotatable piston shaft, a pulley mounted on said shaft between said pedestals, cams on said pulley, and rollers on said pedestals coacting with said cams, all coacting for the purpose specified.

3. In a structure of the class described, the combination of a pair of pedestals, a cylinder having opposed ports,'a piston comprising a pair of heads connected by a longitudinal partition wall, said heads having ports on opposite sides of the said wall, a reciprocating'and rotatable shaft mounted on said pedestals, a pulleymounted on said shaft between said pedestals, cams on said pulley, and rollers on said pedestals coacting with said cams whereby the shaft is reciprocated as the pulley is rotated to reciprocate and rotate the piston.

4. In a structure of the class described, the combination of a base provided with a pair of pedestals, a cylinder, a piston coac-ting with said cylinder, a reciprocating and rotatable shaft for said piston, a pulley mounted on said shaft between said pedestals, cams on said pulley and rollers on said pedestals coacting with said cams whereby the shaft is reciprocated as the pulley is rotated to reciprocate and rotate the piston.

In Witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

KARL 1). SMITH. [1,. 5.

Witnesses Howann A. YOUNG, K. H. QUALEY.

Copies 0! this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

